Free Republic
Browse · Search
Topics · Post Article

Skip to comments.

Teen Pot Use Linked to Decline in IQ (or why Obama really stunk in the debate!)
NBC News ^ | August 27th, 2012 | Tia Ghose

Posted on 10/07/2012 8:18:16 AM PDT by grayhog

Teens who smoke marijuana see their IQs drop as adults, and deficits persist even after quitting, according to a new study.

"The findings are consistent with speculation that cannabis use in adolescence, when the brain is undergoing critical development, may have neurotoxic effects," study researcher Madeline Meier of Duke University said in a statement.


The study followed 1,037 New Zealand children for 25 years. Subjects took IQ tests at age 13, before any of them had smoked marijuana, and again at age 38. Throughout the study, participants also answered several surveys about their drug use.

Roughly 5 percent of the participants started using marijuana as teenagers. Those who smoked marijuana at least four times a week and used marijuana throughout their life saw their IQ drop an average of 8 points, the equivalent of going from an A to a B student. The drop was not explained by other drug use, years of education, schizophrenia or using marijuana in the day before the test.

People who eventually quit smoking pot still had lower IQs than they did at the start of the study.

Interestingly, people who picked up the habit as adults had no IQ drop, suggesting that marijuana may not be as harmful to the mature brain.

The findings are the first to associate intelligence declines with marijuana use. Past work linked low IQ and marijuana, but couldn't rule out the possibility that people who choose to smoke pot are inherently less smart than abstainers.

It's not clear why pot is bad for teen brains.

One possibility is that teenagers are more vulnerable to marijuana's effects on brain chemistry, said Susan Tapert, a neuropsychologist at the University of California, San Diego, who was not involved in the study.

During adolescence, neural connections are pruned in the hippocampus and the prefrontal cortex, critical regions for learning, memory and planning, Tapert said.

Those regions may also soak up the active ingredient in marijuana."A lot of the areas that are still developing during adolescent years happen to be the areas with high cannabis receptor density," Tapert told LiveScience.

But those who consistently smoke marijuana may simply make less intellectually stimulating choices at critical points in life.

"What people tend to do when they're under the influence is different than they would otherwise," Tapert said.

For instance, pot users may be less inclined to attend classes or do other activities that give the brain a workout. Getting off track early on can also limit future opportunities and thereby reduce IQ, she said.

Related: 10 Ways to Keep Your Mind Sharp

"Teens need to view cannabis as not an entirely benign compound, but as something that can impair your judgment and might not be great for your brain," Tapert said.

The study is detailed Aug. 27 in the journal Proceedings of the National Academy of Sciences.

TOPICS: Constitution/Conservatism; Crime/Corruption; Culture/Society
KEYWORDS: cannabis; debate; drugs; drugwar; marijuana; obama; warondrugs; wod; wodlist; wosd
Navigation: use the links below to view more comments.
first previous 1-2021-24 last
To: grayhog

Not true. Obama did weed and raised his IQ from 50 to 57. Given his state of mind that is a 14% increase! Talk about economic growth! Blah, blah, blah!

21 posted on 10/07/2012 9:41:32 AM PDT by Young Werther (Julius Caesar said "Quae cum ita sunt. Since these things are so.".)
[ Post Reply | Private Reply | To 1 | View Replies]

To: grayhog
Warning: Pot use causes you to want to dance with white girls!

I searched: "does iq drop with age?"

This quote is from just one source, but numerous others agree... as we age, we get dumber! EVERYBODY does, but some more than others.


Perception deficits gradually appear over the life span of individuals and seem to reach problem levels in older adults and can greatly impact functions in people with dementia or other cognitive-impaired conditions.

Note the hypodermic needles...
This message brought to you courtesy of Joseph Kennedy, Alcohol "Importer" and former gangsta!

22 posted on 10/07/2012 9:48:34 AM PDT by WVKayaker (I'm more than happy to be Obama's "enemy of the week" - Sarah Palin)
[ Post Reply | Private Reply | To 1 | View Replies]

To: svcw

OK so that blows my theory why he kept looking down...bright lights might not have been an issue.

23 posted on 10/07/2012 5:26:29 PM PDT by Conservative4Ever (The Obamas = rude, crude and socially unacceptable)
[ Post Reply | Private Reply | To 13 | View Replies]

To: grayhog
people who picked up the habit as adults had no IQ drop

But this gets only passing mention since it doesn't serve the big-government agenda.

24 posted on 10/08/2012 9:20:29 AM PDT by JustSayNoToNannies (A free society's default policy: it's none of government's business.)
[ Post Reply | Private Reply | To 1 | View Replies]

Navigation: use the links below to view more comments.
first previous 1-2021-24 last

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794 is powered by software copyright 2000-2008 John Robinson